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Home >> Nissan-Datsun >> 2009 >> Versa Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0171 >> DTC P0133 A/F Sensor 1 >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine screw on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Ground Connections Components
      G05932657Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 2.

      NG : Repair or replace ground connections.

  2. RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1

    Loosen and retighten the air fuel ratio (A/F) sensor 1 (2).

    • Air fuel ratio (A/F) sensor 1 harness connector (1)

      Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb) 

      GO TO 3.

      Fig 2: Identifying A/F Sensor 1 Harness Connector
      G05932658Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK EXHAUST GAS LEAK
    1. Start engine and run it at idle.
    2. Listen for an exhaust gas leak before three way catalyst (manifold).
      Fig 3: Checking Exhaust Gas Leak
      G05932659Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 4.

      NG : Repair or replace.

  4. CHECK FOR INTAKE AIR LEAK

    Listen for an intake air leak after the mass air flow sensor.

    OK or NG 

    OK : GO TO 5.

    NG : Repair or replace.

  5. CLEAR THE SELF-LEARNING DATA

    With CONSULT-III 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-III.
    3. Clear the self-learning control coefficient by touching "CLEAR" or "START".
    4. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? 

    Without CONSULT-III 

    1. Start engine and warm it up to normal operating temperature.
    2. Turn ignition switch OFF.
    3. Disconnect mass air flow sensor (1) harness connector, and restart and run engine for at least 5 seconds at idle speed.
    4. Stop engine and reconnect mass air flow sensor harness connector.
    5. Make sure DTC P0102 is displayed.
    6. Erase the DTC memory. Refer to "EMISSION-RELATED DIAGNOSTIC INFORMATION ".
    7. Make sure DTC P0000 is displayed.
    8. Run engine for at least 10 minutes at idle speed.

      Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? 

      Fig 4: Identifying Mass Air Flow (MAF) Sensor Harness Connector
      G05932660Courtesy of NISSAN MOTOR CO., U.S.A.

      Yes or No 

      Yes : Perform trouble diagnosis for DTC P0171, P0172. Refer to DTC P0171 FUEL INJECTION SYSTEM FUNCTION  or DTC P0172 FUEL INJECTION SYSTEM FUNCTION .

      No : GO TO 6.

  6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector (1).
      • Air fuel ratio (A/F) sensor (2)
        • Fig 5: Identifying A/F Sensor 1 Harness Connector
        G05932661Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between A/F sensor 1 terminal 4 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      OK or NG 

      OK : GO TO  8.

      NG : GO TO 7.

      Fig 6: Checking Voltage Between A/F Sensor 1 Terminal 4 And Ground
      G05932662Courtesy of NISSAN MOTOR CO., U.S.A.
  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E8, F8
    • Harness for open or short between A/F sensor 1 and fuse

      Repair or replace harness or connectors.

  8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between the following terminals. Refer to Wiring Diagram.
      CONTINUITY REFERENCE CHART

      A/F sensor 1 terminal ECM terminal
      1 49
      2 53

      Continuity should exist  .

    4. Check harness continuity between ECM terminals 49, 53 or A/F sensor 1 terminals 1, 2 and ground.

      Refer to Wiring Diagram.

      Continuity should not exist  .

    5. Also check harness for short to power.

      OK or NG 

      OK : GO TO 9.

      NG : Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 10.

    NG : GO TO  13.

  10. CHECK MASS AIR FLOW SENSOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 11.

    NG : Replace mass air flow sensor.

  11. CHECK PCV VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 12.

    NG : Repair or replace PCV valve.

  12. CHECK INTERMITTENT INCIDENT

    Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    OK : GO TO 13.

    NG : Repair or replace.

  13. REPLACE AIR FUEL RATIO (A/F) SENSOR 1

    Replace air fuel ratio (A/F) sensor 1.

    CAUTION:
    • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

    INSPECTION END 

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